Bosch AquaStar 250SX NG User Manual

MODEL 250SX NG and 250SX LP - INDOOR MODEL
Temperature Modulated with Electronic Ignition
Suitable for heating potable water only
Not approved for space heating purposes
(Intended for variable flow applications)
250 SX NG - Natural Gas
250 SX LP - Liquefied Petroleum (LP) Gas
6 720 607 057 US (05.12) AL
Warning: If the information in this manual is not
followed exactly, a fire or explosion may result
causing property damage, personal injury or death.
Do not store or use gasoline or other flammable
vapor and liquids in the vicinity of this or any other
appliance.
Improper installation, adjustment, alteration,
service or maintenance can cause injury or
property damage. Refer to this manual. For
assistance or additional information consult a
qualified installer, service agency or the gas
supplier.
In the Commonwealth of Massachusetts this
product must be installed by a licensed plumber or
gas fitter.
Upon completion of the installation, these
instructions should be handed to the user of the
appliance for future reference.
What to do if you smell gas
• Close gas valve. Open windows.
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any
phone in your building.
• If you cannot reach your gas supplier, call the fire
department.
• Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions
• Installation and service must be performed by a
qualified installer, service agency or the gas supplier.
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Bosch AquaStar 250SX NG Specifications

General

Brand	Bosch
Model	AquaStar 250SX NG
Category	Water Heater
Language	English

Summary

Safety Warnings and Precautions

General Safety Warnings

Provides crucial safety advice and warnings before operating the appliance.

Gas Leak and Hazard Procedures

Outlines critical procedures for gas leaks, high temperatures, and flammable vapor hazards.

Appliance Details and Specifications

Features and Technical Data

Lists key features, specifications, capacity, and control details of the water heater.

Installation Requirements

Details clearances, mounting, combustion air, venting, gas, water, and electrical connection needs.

Gas Piping and Pressure

Covers gas piping standards, sizing, connections, and pressure measurement procedures.

Operation and Maintenance

Operating the Water Heater

Guides on powering, temperature selection, and using the appliance controls and features.

Maintenance and Troubleshooting

Details annual checks, common problems, error codes, and solutions for appliance issues.

Technical Information and Diagrams

Electrical and Functional Schematics

Presents the electrical diagram and functional scheme for understanding the appliance's logic.

Interior Components and Parts

Provides diagrams and lists of internal components and replacement parts.

CO2 Level Adjustment Procedure

Step-by-step guide on measuring and adjusting CO2 levels for optimal combustion.

Warranty and Installation Support

Environmental Protection and Warranty

Covers water conservation, environmental considerations, and the product's limited warranty terms.

Installer Checklist

A checklist for installers to perform and document upon completion of the installation.